Electrically-heated trowel



`Sept-9, 1924. 1,507,807

M. L. BEESON ELECTRICALLY AHEATED TRowEL Filed March 19. 1923 www A TTORNEY Patented Sept. 9, 1924.

UNITED STATES MARVIN L. BEESON, F LOS ANGELES, CALIVFORNIA.

ELECTRICALLY-I-IEATED TROWEL.

Application filed March 19, 1923.

To a-ZZ whom it may concern:

Be it known that I, MARVIN L. BnnsoN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a certain new and useful Electrically-Heated Trowel, of which the following is a specilication.

My invention relates to trowels, particularly to electrically heated trowels adapted to be used in finishing mastic flooring, wall structures and paving or in laying composition roofing paper having an asphaltic or similar base, and the objects of my inven` tion are: first, to provide a trowel of this class for finishing fiooring, walls, paving or roofing, which is ver f light of weight and may be easily manipulated and used in places inaccessible by conventional heated rollers or like apparatus, used for this purpose, which are of great weight and cum- `bersome; second, to provide a trowel of this class for heating the mastic or asphaltic material used for said purposes, for makingthe same more plastic or pliable and providing efficient means for smoothing and finishing the same; 't-hird, to provide a novelly constructed, electricallyy heated trowel, and fourth, to provide a device of this class which is particularly'simple and economical of construction," durable, compact and which will not readily deteriorate or get out of order.

With these and other objects invview, as will appear hereinafter, my invention'consists of certain novel features of construcf tion, combination and arrangement of parts.

and portions as will be hereinafter described in detail, and particularly set forth in the appended claims, reference being had to the accompanying drawings and to the characters of reference thereon, which form a part of this application, in which:

Figure 1 is a side elevational view of my Serial No. 625,945.'

portion taken through 4-4 of Fig. 3; and Fig. 5 is a fragmentary, slightly reduced, plan view of the heating unit, showing certain parts and portions broken away to facilitate the illustration.

Like characters of reference refer to similar parts and portions throughout the several views of the drawings.

The upper casing member 1, lower casing member 2, screws 3, handle member 4, screws 5, insulating members 6, 7 and 8, heating element 9, heating element casing 10, heat insulating member 11, terminal posts 12, insulating washers 13, and the nuts 14, constitute the principal parts and portions of my electrically heated trowel.

The casing of my trowel consists of an upper casing member 1 and a lower casing member 2, secured together by means of screws 8. The casing member 1 is provided at its under side with a hollowed out portion 1a, likewise the casing member 2 is provided at its upper side with a hollowed out portion 2a, said hollowed out portions forming a compartment for the reception of the heating unit of my trowel. The

yfront portion of the upper casing member is slightly reduced in thickness to reduce its weight, to permit the trowel being used in narrower spaces and otherwise to facilitate its handling. It will be noted that the lower casing member 2 is rectangularly shaped with straight sides and ends, and plane at its bottom to facilitate the smoothing and finishing of the flooring, walls, paving or roofing. The front and rear walls 1b and 1c of the upper casing member 1, forming the hollowedv out portion, extend into they lower casing member 2 to securely position the members 1 and 2 with each other. The member 1 is provided on its upper side with upwardly extending lugs 1f1 and 1", which Aare provided respectively with slots 1f and 1g on their inner sides, eX- tending therein from their upper ends for the reception of the lug portions of the handle member 4. The handle member 4 is held in position on said lugs 1d and 1e by the heads of the screws 5, which are screwed into the upper ends of said lugs, the heads of which bear against the lug portions of the handle member 4.

The heating unit of my trowel consists of heating element 9, supported and wound on the insulating member 6, preferably a plate of mica, positioned in the sheet metal casing l0, which surrounds the same and is insulated therefrom` by the insulating members 7 and 8, also preferably of mica. The heat' ing element is so wound on the member 6 that the center of its length, which is the portion of greatest resistance .and heat, is`

positioned near .its front end, the element extending backwardly from Athe front lpor- ,tioii of the trowel lin double, intermediate A and contiguous order. A heat resisting'ina- Vvterialll, preferably of asbestos, is positioned f between the upper-portion of the heating element casing and the wall of the upper casing member l, to reduce the conduction of heat thereto, thereforeminimizing the'loss of heat.

The rear upperportion ot' the heating eleinent casingiO is providedwith aii inclined,

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oii'set portion 10a, the front portion of which extends above the upper portion of the casing and n'the rear portion extends below thel upperportion of the saine. The mica insulating members 6, 7 and 8 are provided with openings near their rear ends to receive? the'ott'set portion lOaoffthe casing l0, as shown best in Fig. 3 ot the drawings. The

heat insulatingmember-.ll is also provided with an opening, through which extend the terminal posts `l2, which vare secured to the inclined, offset porti-on ofthe casing 10 by the nuts le, and are insulated therefrom by ,the insulating washers 13, also as shown best in F ig. 3 of thedrawings. The ends of the heating element 9 are also secured to the terminal posts l2 by the nuts 14, as shown iii Fig. 4 ofthe drawings.` The upper casing member l is alsoprovided at its rear portion with aii'opening 1h, into which extend the terminal -posts 12, and which openingV vis also adaptedto receive and retain the yplug for lconnecting Ithe tro-wel to a source of electrical energy. 'i

. Though I' haveshown and described av `particular construction, combination andarraiigemeiit of parts and portions, I do not ywish to be limited to. this particular` conlike g that there is provided a trowel of this 7 class-which is very light and may be easily manipulated and is of such asizeaiid shape as to be easily accessible .toismall'places, and thatk I have provided a trowel of this `'class' which isiiovel, very simple and economical of construction, durable, efficient and which asset forth .in Vthe will not readily deteriorate or get out of order. i

Having thus described my invention, what l claim as new and desire to secure by Letters Patent is: Y

l. A trowel of the class described, including anV upper casing member provided with upwardly extending handle supporting portions. at its upper side and a hollow portion in its under side, a lower casing Vmember provided with a hollow portion in its upper side, secured to said upper casing member, a handle secured to the handlesupporting por'- tions ofsaid upper casing member, a readily removable heating unit positioned in the hollow portion between said casing members and clamped therebetween, and heat insulating material positioned between said heating unit and said upper casingmembei.

' 2. vAltrowel ot the class described, includ-- ing an upper casing member provided with upwardly extending handle supporting portions at its upperside and ahollow portion in its under side, a lower casing member provided withl hollow portion inits upper' side, secured to said` upper casing member, a handle secured tothe handle supporting portions of said upper .casing member, a readily removable heating unitV positioned in the hollow portion between-said casing members and clamped therebetween, said yheating unitincluding any insulating member,.an electric heating element 'extending around said insulating member, .a metal casing extending around` said` heating ele- `ment, an electric insulating member'positioned between said casing and said heating element, and heat insulating material positioned-between said-casingv and said upper casing'meinber. 1 V

3. A trowel of the class described, including upper and llower casinoi `members,'pro

vided with alliollow .portion between 'the same, said'casing members being rectangular in shape, a fhandlegmeinber secured to said upper casing member, a readily re-y movable lieating unit, positioned in thehol- Vlow portion betweerrfsaid casing members,

andheat insulating material positioned v between said heating uiiit and said-upper casper side,'and avr heating unit positioned in the hollowportionot said lower casing member.

` 5. A vtrowel of the class described, includingfa vlower casing member, ,rectangular in shape, and'liaving straight sides and ends, and provided in its upper sides withV a Vhollow portion,an upper casing member prol vided with a handle-supporting portion at its upper side, a heating unit positioned in the hollow portion of said lower casing member, and heat insulating material positioned between said heating unit and said upper casing member.

6. A trowel of the class described, including a lower casing member, rectangular in shape, and having straight sides and ends, and provided in its upper side with a hollow portion, an upper casing member provided with a handle-.supporting portion at its upper side, and a heating unit positioned in the hollow portion of said lower casing member, said heating unit including an insulating member, an electric heating element extending around said insulating member, a metal casing extending around said heating element, and electric insulating members positioned between said casing and said heating element.

7. A trowel of the class described, including a lower casing member, rectangular in shape, and having a straight side and ends, and provided in its upper side with a hollow portion, an upper casing member provided with a handle-supporting portion, extending upwardly from its upper side, and its front portion decreasing in thickness towards its front end, and a heating unit positioned between said casing members.

8. A trowel of the class described, including an upper casing member, a lower casing member, secured to the lower side of said upper casing member, said casing members being provided with a hollow portion between the same, a heating unit positioned in the hollow portion of said casing member and clamped therebetween, said heating unit including an insulating member, an electric heating element extending around said insulating member, a metal casing extending around said heating element, and electric insulating members positioned between said casing and said heating element.

9. A heating apparatus, including casing members,y a handle Jfor said casing members and a readily removable heating unit positioned between said casing members, said heating unit including an insulating member, an electric heating element extending around said insulating member, a metal casing extending around said heating element, and electric insulating members positioned between said casing and said heating element, and terminal posts connected to said heating element and supported by said heating element casing.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 7 th day of March, 1923.

MARVIN L. BEESON. 

